1 /*
2  * Copyright (C) 2014 Freescale Semiconductor, Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 
9 #include <linux/cpuidle.h>
10 #include <linux/module.h>
11 #include <asm/cpuidle.h>
12 
13 #include "common.h"
14 #include "cpuidle.h"
15 #include "hardware.h"
16 
17 static int imx6sl_enter_wait(struct cpuidle_device *dev,
18 			    struct cpuidle_driver *drv, int index)
19 {
20 	imx6_set_lpm(WAIT_UNCLOCKED);
21 	/*
22 	 * Software workaround for ERR005311, see function
23 	 * description for details.
24 	 */
25 	if (cpu_is_imx6sl())
26 		imx6sl_set_wait_clk(true);
27 	cpu_do_idle();
28 	if (cpu_is_imx6sl())
29 		imx6sl_set_wait_clk(false);
30 	imx6_set_lpm(WAIT_CLOCKED);
31 
32 	return index;
33 }
34 
35 static struct cpuidle_driver imx6sl_cpuidle_driver = {
36 	.name = "imx6sl_cpuidle",
37 	.owner = THIS_MODULE,
38 	.states = {
39 		/* WFI */
40 		ARM_CPUIDLE_WFI_STATE,
41 		/* WAIT */
42 		{
43 			.exit_latency = 50,
44 			.target_residency = 75,
45 			.flags = CPUIDLE_FLAG_TIMER_STOP,
46 			.enter = imx6sl_enter_wait,
47 			.name = "WAIT",
48 			.desc = "Clock off",
49 		},
50 	},
51 	.state_count = 2,
52 	.safe_state_index = 0,
53 };
54 
55 int __init imx6sl_cpuidle_init(void)
56 {
57 	return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
58 }
59